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High Speed! optimized for speed gameplay with help by http://www.tetrisconcept.com hardcore gamers.

OpenGL, OpenAL fully hardware accelerated using open standards.

Gravytris is a unique combination of Tetris and Columns with realistic gravity effects.
The simple principle of tile stacking in tetris to delete full rows is
combined with the fast paced color matching in Columns.
In Gravytris you may delete lines or colors in the same game.
Another unique feature is the realistic calculation of gravity.
All blocks fall until they reach the bottom or a supporting stone. If you play other tetris games,
you will sometimes notice free blocks "hanging in the sky", if a deleted line splits a tile.
This no longer happens in Gravytris and makes the gameplay more surprising.
lately i found this great explanation about tetris and gravity on wikipedia:
http://en.wikipedia.org/wiki/Tetris

just for fun, here is the initial version of gravytris:
Version 0.1, 20.05.2002
this version was written in 5 days and is missing many features rumoring in my mind. but nevertheless it's already playable, though it has no highscore counting yet.